Yellow glass composition



Patented May 12, 1942 STATES ATENT Henry H. Blau, Corning, N. E, and Weston H. Gillett, Look No. 4, Pa... assignors to Corning Glass Works, Corning, N. Y., a corporation of New York No Drawing. Application June 25, 1938, Serial No. 215,918

'2 Claims. (01. 106-54) This invention relates to glass and more parduced which is very desirable for use in the fabriticularly to yellow or amber tinted glass. Gencation of table ware, art glass and the like. erally speaking, such glasses are very difficult to Heretofore it has been very diflicult to obtain a produce with uniformity and it has heretofore proper ivory color for such uses and those which been practically impossible to obtain a satisfaca e b en in us w e Subject to uc uncertory yellow or amber color which, in soft or basic minty in t Control, Particularly Wh y glasses of the ty e commonly used for ontin contained fluorine. On account of the stability ous tank production, would be insensitive to variof t ir co r, o r ew asses a r u a ly ations in melting conditions. Among the masuitable for tank melting.

terials used for coloring prior yellow glasses are e P uc ion of a yellow or amber tint with included selenium, carbon, sulfur, cadmium sula Small Percentage f nickel depends r y p fide, iron, manganese, cerium, titanium, silver, the presence of zinc oxide in the glass. This is etc. Most of these coloring agents are sensitive Proved y the e t t if i c s o t d 01' reto oxidation and reduction. Some of them are placed with other constituents such as lea im volatile at glass melting temperatures. All of a s a, a ta, t t e c r reverts to aviolet them are unsatisfactory f tank lti or grayish coloration. Provided zinc is present The primary object of this invention is to proin Substantial amount, however. pp b duce a yellow or amber tint d glass, th color of quantities of other constituents may be tolerated which is substantially insensitive to variations in Without undue discoloration ef y the zi c melting and annealing conditions and which is oxide content s d o exceed about particularly adapted for melting in continuous cause too la e n unt f inc bleaches the tank furnaces without variations in color. yellow c010! and it becomes 0 p A e 0X- Another object is to produce an ivory tinted ide content as low s is effective in pr ucopal glass of uniform color characteristics. ing the yellow 0 0 but mu h below this the To these and other ends the invention color tends toward violet. Alkali oxide has an prises a glass containing silica, alkali oxide, zinc Opposite effect and its content should preferab oxide and f o about 305% to about 1 nioko1 be low. Potash may be substituted wholly or oxide in part for soda without markedinfiuence on the Another embodiment of the invention voom color. Borio oxide insmall percentages has no prises a, yellow tinted glass containing silica, alserious eflfect on the color. Large amounts tend kali oxide, zinc oxide and from about .005% to to favor the yellow Ahhhihahlso may h about .1% of nickel Oxide and containing an Present in amounts up or 12% without opacifying agent appreciable efiect on the color.

Nickel in glass appears to be insensitive to oxi- The yehOw amber tint pmduced by nickel dation and reduction and is not volatile. The in accordance with our invention may also be transmission curves of prior nickel-containing employed with advantage to modify the color glasses, however, are in general irregular with pmduced. by other coloring oxides' For example no sharply defined transmission bands and such the color produced by uranium contains too much curves show a relatively low transmission in the green for some purposes In zinc'containing yellow and relatively higher transmission in the 40 lass the combination of small amounts of nickel violet and red depending upon composition In and uranium 1n the proportions of about one to other words, nickel produces in ordinary glasses three produces very good amber'yenow tint an indefinite color which tends toward either and the glais an wacifier violet or brown. In certain glasses of highly the'result lsabeaumul ivory tint acidic character, such as glasses free from alkali The following compositions which were calcuor containing large amounts of bone oxide with lated from their respective batches, are examples low alkali content, the color becomes more nearly glasses made in accordance with this invenamber. Consequently, nickel has found little use in glass except as a decolorizer and in relatively large concentrations for making black or smoke h A h D E colored glasses.

We have discovered that zinc increases the g} 3-2 2- 8-3 transmission for yellow and lowers the trans- 1Z2 mission for blue and violet in low nickel glasses, ;;g 2 i2} provided the alkali content is not too high, and 4- 413 we have found that in a glass containing zinc IIIIIIII if?) "i513" oxide the introduction of a small percentage of 2 .01 .04 (iii nickel oxide, from .005% to about .1%, produces :3 a light yellow tint which is easy to control and if the glass is opal a pleasing ivory tint is pro- Gla'sses A and B are opal zinc glasses containing nickel and having a pleasing ivory tint, B being somewhat deeper in color on account of its higher nickel content. Glasses C and D are transparent and have a pale yellow or amber color, D being a low expansion zinc borosilicate. E is a zinc opal glass containing nickel and uranium and is ivory in color.

We claim:

1. A yellow tinted glass containing silica, alkali oxide, zinc oxide and from about .005% to about .l% nickel oxide.

2. A yellow tinted glass containing silica, alkali, boric oxide, zinc oxide and from about .005% to about .1% of nickel oxide.

3. A yellow tinted glass containing silica, alkali, zinc oxide, a small amount of uranium oxide, and from about .005% to about .l% of nickel oxide.

4. An ivory colored glass containing silica,

alkali oxide, zinc oxide and from about .005% to about .1% of nickel oxide and containing an opacifying agent.

5. An ivory colored glass containing silica, alkali oxide, zinc oxide, a small amount of uranium oxide, and from about .005% to about .1% of nickel oxide and containing an opacifying agent.

6. An ivory colored opal glass containing silica, alkali, zinc oxide, fluorine and from about .005% to about .1% of nickel oxide.

7. An ivory colored opal glass containing silica, alkali, zinc oxide,- fluorine, a small amount of uranium oxide, and from about .005% to about .1% of nickel oxide.

' HENRY H. BLAU.

WESTON H. GILLET'I. 

